基于改性植物多酚的高温高密度环保型水基钻井液  

A high-temperature and High-Density Environmentally-Friendly Water-Based Drilling Fluids Based on Modified Plant Polyphenols

作　　者：刘自广 宋丰博 尤志良[2] 卓绿燕[2] 彭云涛 项春芬 蒋官澄[5] LIU Ziguang;SONG Fengbo;YOU Zhiliang;ZHUO Lyuyan;PENG Yuntao;XIANG Chunfen;JIANG Guancheng(The Second Drilling Company of Sinopec Zhongyuan Oilfield Service Corporation,Puyang,Henan 475001;Research Institute of Petroleum Engineering,PetroChina Dagang Oilfield Company,Tianjin 300280;China Petroleum Drilling Fluid,A Branch of GWDC,CNPC,Panjin,Liaoning 124200;No.5 Drilling Engineering Company,BHDC,Hejian,Hebei 062465;College of Petroleum Engineering,China University of Petroleum,Beijing 102249)

机构地区：[1]中石化中原石油工程有限公司钻井二公司,河南濮阳475001 [2]大港油田石油工程研究院,天津300280 [3]中国石油长城钻探工程有限公司钻井液公司,辽宁盘锦124200 [4]渤海钻探第五钻井工程分公司,河北河间062465 [5]中国石油大学(北京)石油工程学院,北京102249

出　　处：《钻井液与完井液》2021年第3期285-291,共7页Drilling Fluid & Completion Fluid

基　　金：国家自然基金面上项目“聚合物拓扑结构及序列结构影响其流变调节能力的机理及结构优化研究”(51874329)资助。

摘　　要：为提高环保型水基钻井液的耐温性能和密度上限,通过对天然多酚类植物提取物进行接枝改性,分别研制了降滤失剂EHT-FL和分散剂EHT-TH,并利用红外光谱对2种合成产物进行了表征。室内性能评价结果表明,降滤失剂EHT-FL和分散剂EHT-TH均具有良好的抗高温性能,且EC50分别达2.38×10^(5) mg/L和4.49×10^(5) mg/L,无生物毒性;EHT-FL加量为2.0%时,淡水基浆在200℃老化后的中压滤失量和高温高压滤失量分别为7.2 mL和23.6 mL;EHT-TH加量为1.0%时,高密度水基钻井液(ρ=2.0 g/cm^(3))在200℃老化后的表观黏度由106.5 mPa·s降低至66.5 mPa·s,高温增稠现象消失。在降滤失剂EHT-FL和分散剂EHT-TH的基础上,配伍其他环境友好型处理剂,研制出一套抗高温高密度(ρ=2.0 g/cm^(3))环保型水基钻井液体系。该体系具有合理的流变与滤失性能,抗温达210℃,抗盐侵25%,抗钙侵1%,抗劣质土侵10%,EC50为4.19×10^(4) mg/L,BOD5/CODCr为29.23,重金属含量低于标准值,对环境友好,能满足深井复杂地层钻井的需求。To improve the high-temperature resistance and density upper limit of environmentally friendly water-based drilling fluids,the fluid-loss reducer EHT-FL and the thinner EHT-TH were developed by modifying plant extracts of natural polyphenol.Two synthesized products were characterized by infrared spectroscopy.In laboratory experiments,the fluid-loss reducer EHT-FL and the thinner EHT-TH exhibited good high-temperature resistance.And the EC50 reached 2.38×10^(5) mg/L and 4.49×10^(5) mg/L,respectively,with no biological toxicity.The medium-pressure and high-temperature/high-pressure fluid-loss of freshwater-based mud with 2.0%EHT-FL are only 7.2 mL and 23.6 mL after aging at 200℃.When the dosage of EHT-TH is 1.0%,the apparent viscosity of high-density water-based drilling fluid(ρ=2.0 g/cm^(3))after aging at 200℃decreases from 106.5 mPa·s to 66.5 mPa·s,and the high-temperature thickening phenomenon disappears.Based on the excellent temperature-resistance of EHT-FL and EHT-TH,a high-temperature and high-density(ρ=2.0 g/cm^(3))environmentally friendly water-based drilling fluid has been developed.This drilling fluid has reasonable rheological and fluid-loss properties.It has high-temperature resistance of 210℃and resistance to 25%salt contamination,1%calcium contamination,and 10%inferior soil contamination.EC50 of this drilling fluid is 4.19×10^(4) mg/L,BOD5/CODCr is 29.23,heavy metal content is lower than the standard value,non-toxic,biodegradable.Therefore,this environmentally friendly drilling fluid can meet the drilling needs of deep-wells complex formations.

关 键 词：水基钻井液 高温 高密度 降滤失剂 分散剂 植物多酚 环境保护 

分 类 号：TE254.3[石油与天然气工程—油气井工程]